相位梯度自聚焦在FFBP聚束SAR处理中的应用

doi:10.3969/j.issn.1001-2400.2014.03.005

Abstract

Abstract:

Fast Factorized Back-Projection (FFBP) is an effective algorithm constructed based on aperture factorization. It is shown that the image quality is barely sacrificed compared with Back-Projection (BP). Different from frequency domain algorithms, SAR images reconstructed by FFBP cannot satisfy the requirement of autofocus. To solve this problem, we propose an improved FFBP (IFFBP) by introducing a fire-new coordinate system in this paper. Then, IFFBP can provide autofocus with Fourier transform pairs (FTP) between the image domain and the range compressed phase history domain. With a different framework of the overlapped subaperture in different stages, phase gradient autofocus (PGA) can be embedded into IFFBP to obtain a robust estimation of the phase error. Finally, the processed results of the collected data set validate this approach in spotlight SAR imagery.

Key words: fast factorized back-projection (IFFBP), pseudopolar coordinates, Fourier transform pairs, phase gradient autofocus, motion compensation

LI Haolin;CHEN Lulu;ZHANG Lei;XING Mengdao;BAO Zheng. Phase gradient autofocus within FFBP flow for spotlight SAR processing[J].J4, 2014, 41(3): 26-32.

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Phase gradient autofocus within FFBP flow for spotlight SAR processing

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